| Summary: | Exception handling is a programming language feature that can help increase the
reliability of programs. However, not much work has been done on exception handling in
visual programming languages. We present an approach for improving the exception
handling mechanism in Forms/3, a declarative visual programming language based on the
spreadsheet paradigm. We show how this approach can be added without sacrificing
referential transparency and lazy evaluation in Forms/3. We then present a comparison of
the Forms/3 exception handling mechanism with the mechanisms available in Java, C++,
Prograph, Haskell and Microsoft Excel, based on their expressive powers. === Graduation date: 1998
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